21335130020 has 48 divisors (see below), whose sum is σ = 47288619840. Its totient is φ = 8063162496.

The previous prime is 21335130017. The next prime is 21335130029. The reversal of 21335130020 is 2003153312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21335129974 and 21335130001.

It is not an unprimeable number, because it can be changed into a prime (21335130029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66479 + ... + 217001.

It is an arithmetic number, because the mean of its divisors is an integer number (985179580).

Almost surely, 2^21335130020 is an apocalyptic number.

21335130020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21335130020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23644309920).

21335130020 is an abundant number, since it is smaller than the sum of its proper divisors (25953489820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21335130020 is a wasteful number, since it uses less digits than its factorization.

21335130020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150924 (or 150922 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 21335130020 its reverse (2003153312), we get a palindrome (23338283332).

The spelling of 21335130020 in words is "twenty-one billion, three hundred thirty-five million, one hundred thirty thousand, twenty".